Chinese shoppers stand with shopping bags on a sidewalk along 5th Avenue in New York City, April 4, 2013.

From faking marriage certificates to get honeymoon discounts in the Maldives to letting children defecate on the floor of a Taiwan airport, Chinese tourists have recently found themselves at the center of controversy and anger.

Thanks to microblogging sites in China, accounts of tourists behaving badly spread like wildfire across the country, provoking disgust, ire and soul-searching.

While in the past such reports might have been dismissed as attacks on the good nature of Chinese travelers, people in the world's second-largest economy are starting to ask why their countrymen and women are so badly behaved.

"Objectively speaking, our tourists have relatively low-civilized characters," said Liu Simin, researcher with the Tourism Research Centre of Chinese Academy of Social Sciences.

"Overseas travel is a new luxury, Chinese who can afford it compare with each other and want to show off," Liu said. "Many Chinese tourists are just going abroad, and are often inexperienced and unfamiliar with overseas rules and norms."

When a story broke recently that a 15-year-old Chinese boy had scratched his name into a 3,500-year-old temple in Egypt's Luxor, the furor was such that questions were even asked about it at a Foreign Ministry news briefing.

"There are more and more Chinese tourists travelling to other countries in recent years," ministry spokesman Hong Lei said on Monday.

"We hope that this tourism will improve friendship with foreign countries and we also hope that Chinese tourists will abide by local laws and regulations and behave themselves."

Other incidents have attracted similar anger, including that of a mother who let her children defecate on the floor of Kaohsiung airport in Taiwan, just meters (feet) from a toilet. She did put newspaper down first.

Embarrassment over the behavior of some Chinese tourists has reached the highest levels of government, which has tried to project an image of a benign and cultured emerging power whose growing wealth can only benefit the world.

'Terrible racket'

This month, Vice Premier Wang Yang admonished the "uncivilized behavior" of certain Chinese tourists, in remarks widely reported by state media and reflecting concern about how the increasingly image-conscious country is seen overseas.

"They make a terrible racket in public places, scrawl their names on tourist sites, ignore red lights when crossing the road and spit everywhere. This damages our national image and has a terrible effect," Wang said.

The central government has reissued guidelines on its main website on what it considers acceptable behavior for tourists, including dressing properly, queuing up and not shouting.

To be sure, the influx of newly wealthy Chinese travelling around world has bought economic benefits widely welcomed in many countries, and many tourists are well-behaved and respectful.

More than 83 million Chinese tourists travelled overseas last year, and Chinese expenditure on travel abroad reached $102 billion in 2012, the highest in the world according to the U.N. World Tourism Organization.

By 2020, about 200 million Chinese are expected to take an overseas holiday every year.

Criticism of bad behavior has in the past been leveled at American, Japanese and Taiwanese tourists, when they were also enjoying new wealth and going abroad for the first time.

Eventually, experts say, the criticism will fade.

"Travelling is a learning experience for tourists," said Wang Wanfei, a tourism professor at Zhejiang University. "They learn how to absorb local culture in the process, and get rid of their bad tourist behavior."